1. Department of Plant Pathology, Physiology, and Weed Science; Virginia Tech; Latham Hall Ag Quad Lane Blacksburg VA USA
2. INRA; UR0407 Pathologie Végétale; 84143 Montfavet Cedex France
3. Department of Statistics; Virginia Tech; Blacksburg Virginia USA
4. Biosciences; University of Exeter; Exeter EX4 4QD UK